CN-122018163-A - Optical waveguide optical-mechanical system and near-to-eye display device

CN122018163ACN 122018163 ACN122018163 ACN 122018163ACN-122018163-A

Abstract

The application relates to the technical field of optics, and provides an optical waveguide optical-mechanical system and near-to-eye display equipment, wherein the optical waveguide optical-mechanical system comprises an image source; the first lens is arranged on the light emitting side of the image source, the first object side surface of the first lens is a concave surface, the first image side surface of the first lens is a convex surface, the second lens is arranged on the image side surface of the first lens, the second object side surface of the second lens is a concave surface, the second image side surface of the second lens is a convex surface, the third lens is arranged on the image side surface of the second lens, the third object side surface of the third lens is a concave surface, the third image side surface of the third lens is a convex surface, the fourth lens is arranged on the image side surface of the third lens, the fourth object side surface of the fourth lens is a convex surface, the fourth image side surface of the fourth lens is a concave surface, the fifth lens is arranged on the image side surface of the fourth lens, the fifth object side surface of the fifth lens is a concave surface, the fifth image side surface of the fifth lens is an even aspheric surface, and the other lens surfaces are spherical surfaces. The application realizes high-performance imaging and reduces the complexity and the production cost of the system.

Inventors

YANG HAO
LI LIWEI
XING XIDA
LIU JING
ZHANG YUANHE
LI MIN
ZHANG XINBIN
SONG YANLONG
NIE WEIDONG
DENG JIAN

Assignees

山东北方光学电子有限公司

Dates

Publication Date: 20260512
Application Date: 20260203

Claims (10)

1. An optical waveguide optomechanical system, comprising: An image source; the first lens is arranged on the light emitting side of the image source, the first object side surface of the first lens is a concave surface, and the first image side surface is a convex surface; the second lens is arranged on the image side of the first lens, the second object side surface of the second lens is a concave surface, and the second image side surface is a convex surface; the third lens is arranged on the image side of the second lens, the third object side surface of the third lens is a concave surface, and the third image side surface is a convex surface; the fourth lens is arranged on the image side of the third lens, the fourth object side surface of the fourth lens is a convex surface, and the fourth image side surface is a concave surface; the fifth lens is arranged on the image side of the fourth lens, the fifth object side surface of the fifth lens is a concave surface, and the fifth image side surface is a convex surface; the first lens, the second lens, the third lens and the fourth lens are all spherical lenses, the fifth image side surface of the fifth lens is an even-order aspheric surface, and the other lens surfaces are spherical surfaces.
2. The optical waveguide optical-mechanical system of claim 1, wherein the first lens, the third lens, and the fifth lens have positive optical power; the second lens and the fourth lens have negative optical power.
3. The optical waveguide optical-mechanical system of claim 1, wherein the apertures of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens increase in sequence.
4. The optical waveguide optical-mechanical system of claim 1, wherein, The focal length f1 of the first lens satisfies 28mm < f1<29mm; The focal length f2 of the second lens satisfies 15mm < f2< -14mm; the focal length f3 of the third lens satisfies 24mm < f3<25mm; The focal length f4 of the fourth lens meets the following conditions that-720 mm < f4< -690mm; the focal length f5 of the fifth lens satisfies 31mm < f5<32mm.
5. The optical waveguide optical-mechanical system of claim 1, wherein, The refractive index Nd1 of the first lens is more than or equal to 1.9, and the Abbe number Vd1 is more than or equal to 30; The refractive index Nd2 of the second lens is more than or equal to 1.9, and the Abbe number Vd2 is less than or equal to 20; The refractive index Nd3 of the third lens is more than or equal to 1.8, and the Abbe number Vd3 is more than or equal to 35; the refractive index Nd4 of the fourth lens is more than or equal to 1.8, and the Abbe number Vd4 is less than or equal to 25; the refractive index Nd5 of the fifth lens is more than or equal to 1.7, and the Abbe number Vd5 is more than or equal to 50.
6. The optical waveguide optical-mechanical system according to claim 1, wherein the ratio of the total optical length TTL of the optical waveguide optical-mechanical system to the maximum aperture D of the lenses in the optical waveguide optical-mechanical system satisfies 1< TTL/D <2.
7. The optical waveguide optical-mechanical system of claim 1, wherein the image source is an OLED or Micro-LED display device.
8. The optical waveguide optical-mechanical system of claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all glass lenses.
9. A near-eye display device comprising the optical waveguide optical-mechanical system according to any one of claims 1 to 8; The coupling-in area of the optical waveguide is arranged on the light emitting side of the optical waveguide optical-mechanical system; The optical waveguide optical-mechanical system is used for modulating light rays emitted by the image source into parallel light beams and coupling the parallel light beams into the optical waveguide.
10. The near-eye display device of claim 9, wherein the display device comprises a display device, The optical waveguide is an array optical waveguide, and the length of the array optical waveguide corresponds to the equivalent propagation distance of the parallel light beams in the waveguide.

Description

Optical waveguide optical-mechanical system and near-to-eye display device Technical Field The application relates to the technical field of optics, in particular to an optical waveguide optical-mechanical system and near-eye display equipment. Background Currently, with the rapid development of Virtual Reality (VR) and Augmented Reality (AR) technologies, near-eye display devices place higher demands on the performance, volume, and cost of optical imaging modules. The optical waveguide optical-mechanical system is used as a core optical engine of the device, and has the functions of collimating and modulating the image light beam emitted by the miniature image source, efficiently coupling the image light beam into the optical waveguide and finally projecting the image light beam to human eyes. Currently, the mainstream optical waveguide optical mechanical system mostly adopts a complex structure including a plurality of lenses to correct various aberrations and improve imaging quality. However, such designs generally have the prominent problems that, on the one hand, six or more lenses are often required for the system to obtain a sufficiently large angle of view and good image quality, resulting in a longer total optical length, an increased overall volume and weight, and adverse effects on downsizing and weight reduction of the device, and on the other hand, a plurality of aspherical lenses are often introduced into the design for better control of aberrations such as spherical aberration and distortion. Compared with the conventional spherical lens, the processing of the aspherical lens depends on a high-precision die, and the manufacturing process is complex and high in cost, so that the overall manufacturing cost of the optical waveguide optical-mechanical system is remarkably increased, and the popularization of related consumer electronic products is restricted. Therefore, there is a need in the art for an optical waveguide optical-mechanical system solution that can minimize the number of lenses and strictly control the number of aspheric surfaces used, thereby achieving miniaturization and low cost of the system, while ensuring excellent imaging quality and a large field angle. Disclosure of Invention The application aims to at least solve the technical problems that in the related art, the existing optical waveguide optical-mechanical system uses a large number of lenses, so that the total optical length is long, the whole volume and the weight are increased, a plurality of aspheric lenses are often introduced in the design, and compared with the conventional spherical lenses, the aspheric lenses are processed by a high-precision die, and the manufacturing process is complex and the cost is high. In order to solve the technical problems, the application is realized as follows: The application provides an optical waveguide optical mechanical system which comprises an image source, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a fourth lens, wherein the first object side surface of the first lens is concave, the first image side surface of the first lens is convex, the second object side surface of the second lens is concave, the second image side surface of the second lens is convex, the third lens is arranged on the image side of the second lens, the third object side surface of the third lens is concave, the third image side surface of the third lens is convex, the fourth object side surface of the fourth lens is convex, the fourth image side surface of the fourth lens is concave, the fifth object side surface of the fifth lens is concave, the fifth image side surface of the fifth lens is convex, the first lens, the second lens, the third lens and the fourth lens are all spherical lenses, the fifth image side surface of the fifth lens is aspheric, and the rest lens surfaces are spherical surfaces. The application provides an optical waveguide optical mechanical system, which realizes high-performance imaging and simultaneously remarkably reduces the complexity and the production cost of the system through a five-lens combination and extremely simple aspheric surface use scheme. In the optical structural design, the system sequentially arranges five lenses with specific surface type concave-convex, convex-concave and concave-convex along the optical axis, and adopts the optical power alternate distribution of positive-negative-positive, and the combination effectively corrects spherical aberration, field curvature and distortion, thereby ensuring the imaging quality with high resolution and low distortion in a wide band of 4816-650 nm. In terms of cost control and process simplification, the system has the core improvement that all surfaces of the first lens element, the fourth lens element and the object side surface of the fifth lens element are common spherical surfaces which are easy to process, and only the image side surface of the fifth lens element is designed